/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
interface nsIURI;

#include "nsISupports.idl"

%{C++
#define MEDIASTREAM_FRAMETYPE_NORMAL          0x00000001
#define MEDIASTREAM_FRAMETYPE_DISCONTINUITY   0x00000002
#define MEDIASTREAM_FRAMETYPE_END_OF_STREAM   0x00000004
%}

/**
 * Metadata of the media stream.
 */
[uuid(294adb30-856c-11e2-9e96-0800200c9a66)]
interface nsIStreamingProtocolMetaData : nsISupports
{
    /**
     * Frame type.
     */
    attribute uint32_t frameType;

    /**
     * The total tracks for the given media stream session.
     */
    attribute uint32_t totalTracks;

    /**
     * The mime type of the track.
     */
    attribute ACString mimeType;

    /**
     * The width of the resolution.
     */
    attribute unsigned long width;

    /**
     * The height of the resolution.
     */
    attribute unsigned long height;

    /**
     * The duration of the media stream in units of microseconds.
     */
    attribute unsigned long long duration;

    /**
     * The sample rate of the media stream.
     */
    attribute unsigned long sampleRate;

    /**
     * The timestamp indicates the stream absolute position
     * relative to the beginning of the presentation.
     */
    attribute unsigned long long timeStamp;

    /**
     * The total number of audio channels in the media stream.
     */
    attribute unsigned long channelCount;

    /**
     * The AAC audio codec specific data.
     */
    attribute ACString esdsData;

    /**
     * The AVCC format extradata of H.264 stream.
     */
    attribute ACString avccData;
};

/**
 * nsIStreamingProtocolListener
 */
[scriptable, uuid(c4f6b660-892e-11e2-9e96-0800200c9a66)]
interface nsIStreamingProtocolListener : nsISupports
{
    /**
     * Called when the data may be read without blocking the calling thread.
     * @param index The track number of the media stream.
     * @param data Raw data of the media stream on given track number.
     * @param length The length of the raw data.
     * @param offset The offset in the data stream from the start of the media
     *               presentation in bytes.
     * @param meta The meta data of the frame.
     */
    void onMediaDataAvailable(in uint8_t index,
                              in ACString data,
                              in uint32_t length,
                              in uint32_t offset,
                              in nsIStreamingProtocolMetaData meta);

    /**
     * Called when the meta data for a given session is available.
     * @param index The track number of the media stream.
     * @param meta The meta data of the media stream.
     */
    void onConnected(in uint8_t index, in nsIStreamingProtocolMetaData meta);

    /**
     * Called when the Rtsp session is closed.
     * @param index Track number of the media stream.
     * @param reason The reason of disconnection.
     */
    void onDisconnected(in uint8_t index, in nsresult reason);
};

/**
 * Media stream controller API: control and retrieve meta data from media stream.
 */
[uuid(4ce040f0-c50d-461f-94e2-af5a77fe13a5)]
interface nsIStreamingProtocolController : nsISupports
{
    /**
     * Preprare the URI before we can start the connection.
     * @param aUri The URI of the media stream.
     */
    void init(in nsIURI aUri);

    /**
     * Asynchronously open this controller.  Data is fed to the specified
     * media stream listener as it becomes available. If asyncOpen returns
     * successfully, the controller is responsible for keeping itself alive
     * until it has called onStopRequest on aListener.
     *
     * @param aListener The nsIStreamingProtocolListener implementation
     */
    void asyncOpen(in nsIStreamingProtocolListener aListener);

    /*
     * Get the metadata of a track.
     * @param index Index of a track.
     * @return A nsIStreamingProtocolMetaData.
     */
    nsIStreamingProtocolMetaData getTrackMetaData(in octet index);

    /*
     * Tell the streaming server to start sending media data.
     */
    void play();

    /*
     * Tell the streaming server to pause sending media data.
     */
    void pause();

    /*
     * Tell the streaming server to resume the suspended media stream.
     */
    void resume();

    /*
     * Tell the streaming server to suspend the media stream.
     */
    void suspend();

    /*
     * Tell the streaming server to send media data in specific time.
     * @param seekTimeUs Start time of the media stream in microseconds.
     */
    void seek(in unsigned long long seekTimeUs);

    /*
     * Tell the streaming server to stop the
     * media stream and close the connection.
     */
    void stop();

    /*
     * Notify the streaming controller that the playback has ended.
     * The controller might have to perform certain internal state transition.
     */
    void playbackEnded();

    /**
     * Total number of audio/video tracks.
     */
    readonly attribute octet totalTracks;
};
